Packers, Bears play cat and (frozen) mouse

Posted by ESPN.com's Kevin Seifert
CHICAGO -- Interesting starting lineups for both Chicago's offense and Green Bay's defense.

The Bears opened the game with two receivers and two tight ends, with tight end Greg Olsen lined up as a fullback/H-Back. The Packers countered with their nickel defense, which left Tramon Williams in the starting lineup and eliminated the need for a third linebacker. Williams had been starting at cornerback until the Packers returned Charles Woodson to that position in practice last week.

Given how the Bears essentially use Olsen as a receiver, it makes sense that the Packers would open in a nickel. As for the Bears, I assume Olsen in the backfield represents their "foul-weather" lineup. He caught a seven-yard pass on the Bears' first play but was ineffective as a lead blocker for Matt Forte on their second.